Quality of Service Guide 719
Named Pools
In This Section
This section provides information to configure Named Pools QoS policies using the
command line interface.
Topics in this section include:
• Overview
• Basic Configuration
Overview
The named buffer pool feature allows for the creation of named buffer pools at the XMA,
MDA and port level. Named pools allow for a customized buffer allocation mode for ingress
and egress queues that goes beyond the default pool behavior.
Named pools are defined within a named pool policy. The policy contains a q1-pools context
which is used to define port allocation weights and named pools for buffer pools on Q1 based
IOMs (all IOMs that are currently supported). The policy may be applied at either the port or
XMA or MDA level at which time the pools defined within the policy are created on the port
or XMA/MDA. When the policy is applied at the XMA or MDA level, XMA or MDA named
pools are created. XMA or MDA named pools will typically be used when either a pool
cannot be created per port or when the buffering needs of queues mapped to the pool are not
affected by sharing the pool with queues from other ports. XMA or MDA named pools allow
buffers to be efficiently shared between queues on different ports mapped to the same pool.
However, XMA or MDA named pools do present the possibility that very active queues on
one port could deplete buffers in the pool offering the possibility that queues on other ports
experiencing buffer starvation. Port named pools are created when the policy is applied at the
port level and allow for a more surgical application of the buffer space allocated for a physical
port. XMA or MDA pool names do not need to be unique. If a name overlaps exists, the port
pool will be used. The same pool name may be created on multiple ports on the same XMA
or MDA.
To Next Page
Loading...
